Method for Processing Data Representative of Performances of a Tennis Player

1. A method for representing the performance of a tennis player, the method comprising the steps of: a) the tennis player carrying out a series of strokes hitting a ball with a racquet comprising an integrated system for measuring game data, the system for measuring game data comprising sensors configured to measure the game data, the game data measured by the sensors comprising physical quantities including linear acceleration and angular speed of the racquet during the strokes; b) measuring, in each series of the strokes, game data using the system for measuring game data provided in the racquet, wherein the measured game data comprises the physical quantities including linear acceleration and angular speed of the racquet during the strokes; c) calculating, using the game data comprising the physical quantities measured at step b), during a game period comprising one or several game sessions, said each game sessions comprising series of strokes carried at step a), and transferred from the system for measuring game data into a system for calculating of a display device, at least three parameters representing the performance of the player during the game period, said parameters being chosen between at least a parameter representative of the power developed by the player during the game period, a parameter representative of the endurance of the player during the game period and a parameter representative of the technical skills of the player during the game period, d) displaying on the display device, in the form of a diagram comprising one axis for each parameter calculated at step c), with the axes forming a star with several branches, points corresponding to values of the parameters on the axes in such a way as to form a generally polygon-shaped closed contour encompassing or passing through said points, e) alternatively increasing and decreasing a surface area delimited by the closed contour according to a frequency of the variation calculated according to the effective game time of the player measured during the last game session of the game period.

2. The method according to claim 1 , comprising the additional steps of: f) determining, using the game data measured at step b), for each stroke carried out during the game period, the type of stroke among a predefined list of types of strokes comprising at least two types of strokes chosen among at least the forehand, the backhand, the serve and the smash, g) recording, for each type of stroke on the list of strokes, the total number of strokes carried out; h) colouring a surface delimited by the closed contour in a colour that represents the level of the player, with this level being determined according to the total number of strokes carried out for each type of stroke on the list of types of strokes.

3. The method according to claim 2 , further comprising a step of reporting the reaching by the player of a predefined number of strokes for each type of stroke via a change in the colour of the surface delimited by the closed contour and the adopting of a shade corresponding to a higher level in relation to the level wherein the player was before reaching the predefined numbers of strokes for each type of stroke.

4. The method according to claim 1 , wherein the closed contour (A) has a generally triangular shape.

5. The method according to claim 1 , wherein the frequency of the variation of the surface area delimited by the closed contour is limited to a maximum value which is reached when the effective game time during the last game session of the game period reaches a threshold value.

6. The method according to claim 2 , wherein the frequency of the variation of the surface area delimited by the closed contour decreases when the player does not transfer data for a predetermined period of time.

7. The method according to claim 6 , wherein when the frequency of the variation becomes zero, the total numbers of strokes for each type of stroke start to decrease.

8. The method according to claim 1 , wherein, each time data concerning a new game session is transferred by the player into the display device, the variations in the surface area of the closed contour are extended for a period of time calculated according to the effective game time measured during this last game session.

9. The method according to claim 1 , further comprising a step of calculating an average value of the at least three parameters calculated in the step a) and a step consisting in comparing, by means of a data network, the performance of different tennis players based on the average value.

10. The method according to claim 1 , wherein the frequency of the variation of the surface area delimited by the closed contour decreases when the player does not transfer data for a predetermined period of time.

11. The method according to claim 1 , wherein step c) further includes transferring the game data from the system for measuring game data into a system for calculating of the display device by connecting the display device to the system for measuring game data of the racquet using one of the group consisting of i) a wired connection, and ii) a wireless connection.

12. A method representing the performance of a tennis player on a display device, the method comprising the steps of: a) the tennis player carrying a series of strokes hitting a ball with a racquet, the racquet comprising an integrated system for measuring game data, the system for measuring game data comprising sensors, including a triple-axis accelerometer and a triple-axis gyrometer, the sensors configured to measure the game data comprising physical quantities including linear acceleration and angular speed of the racquet according to three directions perpendicular to each other and fixed in relation to a terrestrial reference; b) measuring, in each series of the strokes, the game data using the system for measuring game data provided in the racquet, wherein the measured game data comprises the physical quantities including linear acceleration and angular speed of the racquet during the strokes; c) calculating at least three parameters using the sub-steps of: c1) connecting the racquet to the display device, the display device being a portable display device comprised of a system for calculating performance parameters, c2) transferring the game data from the system for measuring game data into the system for calculating performance parameters of the display device, and c3) the system for calculating performance parameters using the transferred game data comprising physical quantities measured at step b) during a game period comprising at least one game session comprising the series of strokes carried at step a), to automatically calculate at least three parameters representing the performance of the player during the game period, said parameters including at least a parameter representative of the power developed by the player during the game period, a parameter representative of the endurance of the player during the game period, and a parameter representative of the technical skills of the player during the game period, wherein the connecting of the racquet to the display device is performed using one of the group consisting of i) a wired connection, and ii) a wireless connection; d) displaying on the display device a diagram comprising one axis for each parameter calculated at step c), with the axes forming a star with plural branches, points corresponding to values of the parameters on the axes to form a generally polygon-shaped closed contour encompassing or passing through said points; and e) alternatively increasing and decreasing a surface area delimited by the closed contour according to a frequency of the variation calculated according to the effective game time of the player measured during a last game session of the game period.

13. The method for processing according to claim 12 , further comprising the steps of: f) determining, using the game data measured at step b), for each stroke carried out during the game period, the type of stroke among a predefined list of types of strokes comprising at least two types of strokes chosen among at least the forehand, the backhand, the serve and the smash; g) recording, for each type of stroke on the list of strokes, the total number of strokes carried out; and h) colouring a surface delimited by the closed contour in a colour that represents the level of the player, with this level being determined according to the total number of strokes carried out for each type of stroke on the list of types of strokes.

14. The method for processing according to claim 12 , wherein the display device is one of the group consisting of a mobile telephone, a tablet, and a portable computer.

15. The method for processing according to claim 14 , wherein the connecting of the racquet to the display device is performed a Bluetooth wireless connection.